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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae3df7153390e26e5f174d8ce3b5d60c99188059bf7ea4c38120a4803346af8' 
  AND token = 'YbYcVAvNJt54ZbFF5IAqkDbP0D4hUcz25g8G59E6xs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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