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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96bd6bb92464af080d66ebb84b36895d55031c687a582cb1fceffd7efc74d25b' 
  AND token = 'T9eI0b0nKd6QgXCkv6Jh1hy53DS3HTfNYxyfkNyeBro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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