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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f4ca6b734583d1db0162c15f21aebc9c998f3abb5fe7cb7b96d37c34a028cf8' 
  AND token = '/l6oqcFuFUO8Juh1ubWwGAD7nvWyDa67i68sTFgI7QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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