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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c1c50e1c478bd6b95dfccc74d3809ceb8bb8c10aedbc9b5a9cb063493fb0ad7' 
  AND token = '3wRdagDBOXlvQDkGp4mbKMy8qBIqa61T/I84YyGJw+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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