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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bcb2d458364c6a4809d50c897fc49b27591f4aab21310bb7faa73630bdf3c3f' 
  AND token = 'BQ7778VgLxXH66a4c/HJ9m71HYvJSDsEMV3vfr02/m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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