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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7006f33913ad19cda664c5ebc0b81b8d620815674c2718d7013eb0a76d2050' 
  AND token = 'vAHpPdKrEK6m7AYIpX4Znq1ih0YP7pAWFK9fRTpgSws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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