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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0025d775257f74c5ae62a94815bfd565b8cf028ff6ad749ae1f16c40e115688' 
  AND token = 'NFcUAIQAmF0FbXhm10TDVy+TdMbId7ED2K9EqBxBTRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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