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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbaff082d3b4bad2b60370756dd404b4eb734ee2dbe7967bc634bffab9a40cdb' 
  AND token = 'HTj9n3iE7l5NoQ/t+RYrIXBAa0M6CjOXmFtgPzy5BLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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