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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97926e993308e3c493aa9a4c7fd0063e025880e6d5c11e563c250159a68eb4bc' 
  AND token = '4eKUq2CdJaP8/UWrItTDiJsSEuP0B14g0cZV3TtxvcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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