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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e9e82b8b2837b786699128b9d8ff848fd0cecaf903dc913b182ff2d8fef2c4' 
  AND token = 'cyfcUzcrje3ikF6HCkm/BmJbSha5vyT5KufQ9r7ejwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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