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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76323faab2a77607963b5fb303e7cb57009511d56a06ca7d794784c931e6915c' 
  AND token = 'VERd8vJ0QfQzoKyOTHjwNJFanI0F445PehWm6oOH2eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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