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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c766bfb53316cf9213f7a5e9151e64cda89ef6c6a911ac73efed799b171f54f' 
  AND token = 'bY6rqZNrqowo7lyzSI8vTnEA7qbLG4Q0t5EyMJxAwHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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