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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12b053645820aa2b2c70ed491b404639efcf34a04e0de3ec849d141ed8f5beb6' 
  AND token = 'WRN0zxcB1JB3Dg5+yL6XxAfM8yobGI6XqZNElcKkxug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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