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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1489a460e7baaf472bf0374707180aa0c3e3f0a4a8878becb1bedb967ce756cc' 
  AND token = 'V7+h4dLX+gxX8pdJ1vP72kzAerIHXTbqOjM7Cbg0rIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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