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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdfc84c9605293127e58dac84bcdadb84e57a12a4c39a91d32e4fee150738752' 
  AND token = '98KbDI9fy3nsbuu4YgMzRHVpvdjX/CLeYzFb3/FnuZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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