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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '231cdd77f50a47551a5f4c20dd45047f07862c6f9fb55576ee5d62677bc7169b' 
  AND token = 'oD0PbK1zlEHrPm4CYQ84TL/EafA9M2YSXF53LQSo5gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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