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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3ecdcafd1afcbf0b8b3cd8d6cf63a922a907eb1f93f7858a61c47888e006f2' 
  AND token = '9vSAucqpcrbwcuWryx+rhFYB1tl78jF07/QRk9p6Fsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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