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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92697e5c7fb39f1ea3cf61e5354a160c806e588464b75219d45f08e846135a6a' 
  AND token = '4NsT47X2DSBEf00Cl0mOxPjdTrYWTjaZVCuM4HGTsPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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