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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f73a8b41ba986e95a47246c824164ac5288164295e86d77425f1f84d69d1c43f' 
  AND token = '1sVIS/9fKFxS22DdnFEc3xKLwy0whvc8w/uskQuTUZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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