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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '247ca992949e95cc297a306427f874df0fb54addf356ea40ff22ea6f961af438' 
  AND token = 'A+Pw2qtAwSU6WgiNQCbANNyWjilaGVP1uOPoC/Js+Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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