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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cb9bd59cdcbfc8e3d03e4c7f7e2ad06a1f31f401f055046639068fa074ed320' 
  AND token = 'bhACbXxpWt15bdDhir3vTBGyPXs7LTL0O+Ku3fJbUL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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