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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cbc722c5655299e251c1d976343619286f0faa015c485c9577a8722b3a760b9' 
  AND token = '3ez5k+C64Hj9ceTyeT+sn8aUyT7Hue/SXj/UKoUQQR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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