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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd2bc6336d1c964f30019813e9b91d7af7a67b7a440f886387476ead1601618' 
  AND token = 'E8b9l+quSL2WWEO08nn1a1O5S1LgMs+FJ36jHwGZyHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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