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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88416fc7281597ca8db62514384267fb643a5d68c884428b4d77f8ece351e95b' 
  AND token = 'Nzyn6mZjXdT+IQQ0INKFny1WYLYfaeBe4WbWv08irOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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