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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb4ca3395b958eec379723b6f1ebeb2233f0a65a69edb4296a990ef95f0b9ce7' 
  AND token = 'smQGKMsn50qwdHOsePpQmOwaUAV8C5MCTa2C48CgIpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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