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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ae754545d4d96ba669164a55dec60d4d406bcdfa2bd616dfd4b7b68386df38d' 
  AND token = 'Qzsd2BkVhTJWf1EeXFFEfIk64a4NRW+ybr5cYPKsNtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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