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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aaded1559b2b30e01b5e5b0f31a74614926f4f3729413fb4816f7e321f91b58' 
  AND token = 'nTcWIEARleulQQ95rtItVlsDxoDNsPDBMEpxo/69Z1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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