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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '041be8481f976c03c690e729f8e06a2ca16a5b88207a2bcecdc2b48587f4fad9' 
  AND token = 'WlMLWOQR0kietNcOu1pZ6FyaqHSG1oNX0Am3CcB69m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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