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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ced0ebfce61c5b37e829111c93a019887bcfa42155fa52b1b75239d5908480' 
  AND token = 'VFgxMSSg5pTzHb+R4381TOu8T1XG9HGWgt9BCIe/VjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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