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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc4ffb0e272c50115d00fee0541198ada3b9739ff910c7af05ad8d5b7bcdd8af' 
  AND token = 'dKJhmGmEcVUfj1a+/pU8gk92ZCZotNu67f/um8c/U+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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