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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7858bf9142ba4ef320af66c835ceb0088284acc838ea6c9bd5e9bf8b852b1d0' 
  AND token = 'asTsfERba25ncU2GwZgyWg7rIWDdhi0HqBfKhKeWvlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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