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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0756c84d5837f8dfceffdad16daf9c4f521b599d27f4e9b471c83b92817a4cd9' 
  AND token = 'aw4EUQStDQzno/NtYMI50d8guv8BORyMG4NErvfqMKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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