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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdb0e8bdfac06632e6bff128ef6687812ad0a0faa1b75f1c01bbcdd0c92a7fdc' 
  AND token = 'wwIXpiC+eHtk5nJHqxBbkS6qfCvKZuhIffPyymYw3ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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