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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3375ca09c4eb24f2efee7b34f4d2ef850956c5597b94213be1cb536f6c71ca35' 
  AND token = '4v41j2eUWr3HlXyNtHIjXT5fvRqHbyz4PGuakqLPYLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}