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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7bd026c89aa785133d0825c01ef59e64ffecc667d7f7465da78063ae2079a0' 
  AND token = '5GNWgosKFtJt2MLN1gfnC+btgLyDNADBg+Nubsik4LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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