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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '918153420a9f38aca413c4c73207befdd55053a443296e6b829ed92109dd26cf' 
  AND token = 'MKJrzWeSjqbBHfx0rT0sURjO+9bm7aQ53Wq4MR7X/7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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