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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f0d6e012c91f6c5ac1220ae35210e35cbb0100ae18f5b0e0aac141d706e39c2' 
  AND token = '6H/tqmJhb0FoADyQBcwIXwwldnmWT5YuOYpS/eV1+3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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