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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37ce76761611f33cc1f0068f29119ffb91cf1805b5932f8845bf0702f8790a15' 
  AND token = 'UG6MWInGTAOanB0rJfP7WkAjSkiLtM8GGjfvunK9Ej4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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