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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf5c18a4e95bd5e892d4daba957425024312a2e8e6f71923080887cd556cd4a' 
  AND token = 'I2q5h2yOTOYJVgFr7Syps9NYbY+iqJPvJSxepQI7nvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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