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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04049fb2c5a20f2af96ab4a9e6a5da4b9873a098d227b92c59ed1dc4985ab5e2' 
  AND token = 'TlpzwTfcIJTMNDmbM0AlJ4i+tbShnD89vpzj/6KZCfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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