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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f238673766081190a2dd70b085d6f84fd41a3e2425b58d7fda8b64bd76ee7718' 
  AND token = 'NFSME4SwjHhYARtxvetgyxL1o58L5sOdcJvWJ6AkXr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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