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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb67c7467822023daad74e5314ed2105ed42026c22bc59303dc247973e86e08' 
  AND token = 'syjAw0xTNYWnNOPd7PWnFC7Nro5tFNVSGCBc4UidQbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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