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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd177b61335465bbbb1f31f16e3c9bcab4e896f4bbafa179403b19d1710471644' 
  AND token = 'M3twVEqUzSijwKwXVYsfiBKzoZeZrFOqP7rjNwlQ8Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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