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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbe6becabe657960ba73c46618320114f26e063cbdace2ad9446f3e62ae34134' 
  AND token = 'w7STLKxHWw7Hsvo8ACSgOd3yMIiEJrTgj/CNdbVPSsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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