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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd863688fd182e705467db1fa736de7deeb72939761fd5398136771efe8bfee92' 
  AND token = 'R7Q5ItAcmPQ6qIz1Ob03oSibjWmDwzmZvXPZhGfyRrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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