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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef196473cdfbc703c0613d43e876bc4aecfece46f6939d2aa59ba5faa312ba4' 
  AND token = 'f8uMkHfLgYUn29m6XiqQwa4Pvjfc0jLv5yP/VWbPlRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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