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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa34d319f75dfd786adf1a05b02ecbc1f8ba24bd0743c2b29a760ea091003aa' 
  AND token = 'aCAink9CH9Pw4dwv6qQYIbRHsWuvDiIzsl2CKpLEflI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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