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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799d146ceb426ab00b6d760f26df36aaf3d6c07ea83de43d4e714f8401af112d' 
  AND token = 'bkrvCMgt2YvKTqwnbhXw3FJQlIGFHQcss3N6TQffObc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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