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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f94539119b4e8b98d1f40ae176f52325ce1638b5d62163d5aced3f0f30bc3c8' 
  AND token = 'tpmZVAva39kzueO0S6kGUZ0qtlcWriaL6a6lkDg9sYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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