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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a97b4fe2beeb49d607956887ae775a5f5b651917a2604687020ce782b6135e08' 
  AND token = 'Uf85UzThNvQDrMpEd2ZGYztEiHP3Hw3aAxFvhlS0RQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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