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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '881ed80f545f896ab3c31ac8b913944d6153f1a7c91d625aac5c945b2c6096c8' 
  AND token = 'ywK6ntLEk2MKpBmIQbRBvnnuNPlUSkhYFKyWbP40hgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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