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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b45d6190ae179541eb0ea1590a31e16fccdf083153331a8d0a56ccc1c5119b73' 
  AND token = 'apIwHqG+2GDdl6pe/NMZgaIbF9iLTpIURagB3Pp0l/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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