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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1db58bc6d215a16b085d47d8db02ae3dbca2c12c1840b65f70d64f842bae719b' 
  AND token = 'fJnDLhWezcdsK/eODUdmEh5RzVty+rTa7cD90ygBBV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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