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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61401f0e033edff0d423de4376b154b5558ca3b8524dbb311c72349ffe9a770f' 
  AND token = 'TRfg5PZ/gdbMikw3cAVZgwmB6XUcTKnDA75aEM6Xx8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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