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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d1b6fe29360bd0949748d4e6119655ac5ec6a278e27e5cad36d7cc7a2fc2b9a' 
  AND token = 'bdTxDVQ0N3h8B4HvInRKN3ZPZUgH8I0DzxVil2+yHKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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