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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feff13eb5900a446551751bdd58a5b861a57a7b58beab409699331261d0a15e0' 
  AND token = 'Vnl+c4B9cc6eHGqVXDoT2UHNP10ulkbWpM/ypCyYL1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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