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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b80d86abf40fc20c036ab47c28a76036b4c19eeb2dc52e768cea12eac9b8d40b' 
  AND token = 'pzmi+JIgVj7aswAdj4G8DcsK//Kh63edC3MQ+bYgCb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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