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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c14f4f176ff95069d95d73c408d3a18390b670182ba94bc8aa2111fdb041086e' 
  AND token = '4Ys4BxYipnCFPcgXz9w1Y/+7sIaTxPM93oWjJ5TO+ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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