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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a210a5b9ab8e8b9eb425ae6984b17c33aa455527c902621b2a985a4e01975219' 
  AND token = 'XiVu18V2SjJdpk2H6z9PVtc4oQntXou0ru5B3WtKKiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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