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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffad2583c6c203ea621abf5d2edc085e33faf677e5f4a3f98fc57cd91e28c228' 
  AND token = 'LAZXZH7fXDIwJ0pKP8paBtsiCU/PLcU99ZC9u25vZT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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