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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e3290150f6f5cf57c2722a3f938a3b124834c9d3a861247eef3b239828592d5' 
  AND token = 'L53PObtQbbiFVXSMt2HIyfpjwcdSGB9skC1h1zjVuEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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