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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908a3c404a3b205458332a4e04df07150e175d1308ecfa44cfa07b292dea53bd' 
  AND token = '5CTGQ8v38Zzf6Osrmmf+buttNaEGDBaiLsa5oD+f2uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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