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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6060ac0c2d89f61ebb193e33706516fe5dfc70f2ff438d5cad6c9fd878735bfb' 
  AND token = '4qam/zcd0jmddXKKhXy2vfdQIt0Ox+AjxpyZNt/51QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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