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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fcb7ff5dbceff71bbab80bf8e89d0b659fbd1ea076539ad1c95e99fe09f351a' 
  AND token = '+l8PEb1svT8LRDRDATbteWknsdAHqe+QXlYhmFukOAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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