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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa05ce327665644fa6fea129109f23f055c4936cce7a9ccee698128a14c503c' 
  AND token = 'krLbqkte6dSarMQVm53UNiSjnt3TUVNBNGyuwuo4+lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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